ok just got a crappy ph probe meter for now( digi PH on the way) and my soil is reading around 7.5ish and my runoff is around 7. since i have no nutes or ph up/down i just used a lil vinegar in a 5 gallon bucket to get my water ph around 5.5-6 and im using that to flush. should i be doing that? what ph should my water be at to flush my soil?